Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a46cb91c81660…

MALICIOUS

PDF

76.5 KB Created: 2021-02-27 03:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f200940e8d1d245a4de6b28f019fc83f SHA-1: 514ee716c8c75655974b90be696e6abdf8ca28aa SHA-256: 662a46cb91c816608f655bcf0e0d0173f95485c3410a4733ac024269feb7e0cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL being `https://jottigo.ru/strik?utm_term=the+art+of+raising+a+puppy+crate+training`, suggesting a phishing or malware distribution lure. The PDF structure and the presence of embedded links point towards a tactic of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=the+art+of+raising+a+puppy+crate+training PDF link annotation
    • http://dkmz1.club/hp_elitebook_2740p_ram_specssap8q.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/hjQRfig/cannot_repost_instagram_post_to_story.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/sukarimubidolize.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/guzijuluxazojaxe.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/83869108825.pdfIn PDF document text
    • http://majikok.mygamesonline.org/kirby_heritage_84_vacuum_bags.pdfIn PDF document text
    • http://latuwuka.iblogger.org/13854854200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemunebo.atwebpages.com/tuvipifisot.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/pijipan.pdfIn PDF document text
    • http://nanoxujam.epizy.com/gegeli.pdfIn PDF document text
    • http://monuwuwotivonil.epizy.com/excel_vba_make_worksheet_active.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/wallpaper_hd_for_jio_mobile_free.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/what_type_of_expense_is_freight_considered.pdfIn PDF document text
    • http://xoviketi.epizy.com/goxapegunaxazesasebosixu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 5296 bytes
SHA-256: b485a2f3670aa24ca8315dc6173f27df0d616739a3dda4100c1f226b4f18dbf5
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10412 bytes
SHA-256: 07bc3ceede2ca13cf490c35d6067519bed19e7014214a48f26b305dc7c52bd79

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